The coil of a moving coil galvanometer has 100 turns each of area` 15 cm^(2)`. It is suspended in a radial magnetic field of induction `3 xx 10^(-2)Wb//m^(2)`. What is the current senstivity of the moving coil galvanometer, if the torsional constant of the suspension fiber is` 1.5 xx 10^(-8)Nm`/radian`?

Options

A. `1.5 xx 10^(5)`rad/A
B. `3 xx 10^(5)`rad/A
C. `4.5 xx 10^(5)`rad/A
D. `6 xx 10^(5)`rad/A

Answer

B

Explanation

Current senstivity`=(dtheta)/(dI)=(nAB)/K=(100 xx 15 xx 10^(-4)x 3 xx 10^(-2))/(1.5 xx 10^(-8))=3 xx 10^(5)`radian/ampere.